Fix crash when cxx="" and g++ is present.
fix import problem.
remove duplicate variable not used. They are already in self.
Add some code to help the development of the scan cython file.
pep8
Do the vector workaround only on TensorVariable and document it.
small fix that prevent the merge optimizer to merge ops.
Consider TensorConstant for the workaround too.
some pep8
Added link to new theano tutorial.
Merge pull request #1946 from nouiz/scan

Small scan speed up on the GPU.